Development of a system of ventilation of submarine storage batteries is discussed. This system employs cooling through the cell lugs, for the purpose of replacing, if possible, the present ventilation system. Measurements of cell temperatures under a variety of conditions using the system developed and the present closed-cell system were made. It was found that under ordinary conditions of ambient temperature the proposed system should be either equal to or better than the present system in cooling efficiency. The proposed system can cut the water-loss from the cells to small fraction of the amount lost under the closed-cell system. It enables the cell to be completely sealed, except for a small vent hole, thus preventing acid spray and electrolyte spillage. An ''open- type'' system of ventilation employing induced air flow through the cell is feasible but less practical than the proposed system. Cooling through the sides of the cell was studied and it appears that cooling by this means would be a good supplement to any system used. Suggestions are made for increasing the cooling efficiency of the proposed system.